Thomas rodda



@anni Staten 'pero ewa-4.

THOMAS nonna, or sT.-'LoUIs, MISSOURI.

Letters Patent No. 105,129, dated .Tidy 5, 1870.

REVBRSING--VALVE FOR STEAM-ENGINES.

The Schedule referred to in these Letten:- Patent and making part of the same.

To aZL whom it may concern.:

" Be it known that I, THOMAS RoDDA, of St. Louis, iu the county of St. Louis and State of Missouri, have y made certain new and useful Improvements lin Valves suitable form, which may be operated to reverse the direction of the steam passing to and from the valvechest 'of a steam-engine. My said device, therefore, avoids the use of a reversing-gear, and the Stevenson link-movement on locomotives.

To enable those herein skilled to make and use my said invention, I will now more fully describe the same, referring herein to the accompanying;-

Figure 1 as a top plan; to

Figure 2 as a bottom plan to Figure 3 as a side elevation; and, to

Figure 4 as asectional plan at linezay, all said gures representing my said reversing-valve or cock, in

one of its usual forms. l

The-same is made of metal, of a body-piece, A, to which are bolted, in a steam-tight manner, the covers B and B. Y

Centrally, in the cruciform body, I arrange the coneplug O, with the usual ground joint. Said plugr is operated by the handle c. The plug has the incisions cl c, which, when in line with the openings and passages in the body A, determine the steam course.

The steam andl exhaust-pipes will be arranged' as follows: Y

The live steam from the boiler will be received at I tlc pipe D, the exhaust-pipe D connecting with the air or the heater-drum, or the condenser will connect therewith these parts, this being, preferably, connected with the upper part of the valve-box A B B'.

The pipe E then connects with the steam-chest like the ordinary steam feed-pipe. The pipe E', standing opposite, connects with the exhaust-,opening In the steam-chest, like the ordinary exhaust-pipe.

Supposing, now, the valve-plug C to hold the position indicated in tig. 4. Steam enters at D, passes, in the body'of the valve-box, toward the exit E, and from this to the usual steam-chest, in the manner usual. Exhaust steam goes to the pipe E', and thence to the exit-pipe D'.

If, now, the position of the valve-plug O is changed from Cl to C2, (see i'g. 4,) then live steam will enter from D, and pass to the pipe E', and, through the exhaust-opening of the steam-chest, into the end of -the cylinder, which the moment before was exhausting steam, while the pipe E will then receive the exhaust steam, and, communicating with the pipe D', will discharge the same. A reverse motion of the engine will therefore take place, as intended.

It is plain that, as the feed of live steam is'at times made through 'the exhaust-port in the steam-chest, in the application of my said invention, there are, therefore, necessary valves, which, like the D-slide val've, will permit steam so to enter and operate..

Having thus fully described my said invention,

The valve A B B' C, arranged with its pipes D D' and E E', and operating in connection with the valve of a steam-engine, substantially as and for the purpose set forth.

In testimony of said invention I have hereunto set` my hand this 22d day of December, A. D. 1869, in

the presence of two witnesses.

THOMAS RODDA.

Witnesses:

WILLIAM W. HERTHEL, ROBERT BURNS. 

